convection

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current

 [kur´ent]
1. something that flows.
2. specifically, electricity transmitted through a circuit.
alternating current a current that periodically flows in opposite directions; its amplitude fluctuates as a sine wave.
convection current a current caused by movement by convection of warmer fluid into an area of cooler fluid.
direct current a current that flows in one direction only; when modeled as a wave, its amplitude is constant. When used medically it is called galvanic current. This current has distinct and important polarity and marked secondary chemical effects.
galvanic current a steady direct current.
current of injury an electric current that flows between injured myocardium and normal myocardium, because such cells have a reduced membrane potential; it may be either diastolic or systolic.
current of injury, diastolic the current that flows from injured to noninjured tissue during electrical diastole.
current of injury, systolic the current that flows from healthy tissue to injured tissue during electrical systole.
inwardly rectifying current current that rectifies so that it passes more easily towards the interior of a cell.
leakage current the electrical current that exists in the parts or metal case of electrical equipment.
outwardly rectifying current current that rectifies so that it passes more easily towards the exterior of a cell.
potassium rectifying c's transmembrane currents that rectify inwardly or outwardly to make adjustments in cellular functions; they are mainly responsible for the repolarization phase of the action potential. There are at least six mechanisms by which potassium ions move across cardiac cell membranes in the role of rectifier.

con·vec·tion

(kon-vek'shŭn),
Conveyance of heat in liquids or gases by movement of the heated particles, as when the layer of water at the bottom of a heated pot rises or the warm air of a room ascends to the ceiling.
[L. con-veho, pp. -vectus, to carry or bring together]

con·vec·tion

(kŏn-vek'shŭn)
Conveyance of heat in liquids or gases by movement of the heated particles, as when the layer of water at the bottom of a heated pot rises or the warm air of a room ascends to the ceiling.
[L. con-veho, pp. -vectus, to carry or bring together]

convection

the propagation of heat through liquids and gases by the movement of the heated particles, increasing their kinetic energy.
References in periodicals archive ?
FIGURE 12 A Hawaii eruption from the Pu'u 'O'o vent in Hawaii showing a convecting cloud of gas and small particles in the atmosphere above the 300 m high lava fountain (commonly termed fire fountain) of coarser basaltic pyroclasts.
Were they born when the Earth was born, somehow escaping mixing in the constantly convecting mantle?
Therefore, several different schemes to deal with the initial orientation state were introduced in the present study: i) by convecting the orientation state at each layer from the neighboring element (i.e.
I can't answer the question about your neighbors, but your roof's structure has been rotting slowly and the obvious reason is moist air from the conditioned space convecting into the hot roof with no way to escape and no way for the framing, roof decking and insulation to dry up.
Even if Venus has a convecting liquid core, the planet's 243-day spin rate is simply too slow to generate a magnetic dynamo.
Naturally convecting hot water below the surface will be utilized by power projects, , but most geothermal energy is stored in impermeable hot rocks, so the Newberry project is intended to exploit such rocks by fracturing them with pressurized water to increase their permeability enough to support geothermal operations.
"It's not clear why the inner core should be convecting. It's a metal and so is a good conductor of heat," says Michael I.
In winter data the seasonally exposed mode waters form a smoothly varying ring of progressively colder and more deeply convecting waters (see [ILLUSTRATION OMITTED] at left).
The problem is keeping the Moon's interior molten and convecting after it should have cooled and hardened.
Another group, call them the splitters, argues that the upper and lower mantle remain separate, each convecting on its own like the stacked pots of a double boiler.
Thus our picture can be thought of as a snapshot of the temperature pattern in Earth's convecting mantle.
As to Tyvek having been developed for another purpose, long ago I learned in a lecture given by the senior scientist of a most respected residential research association that Tyvek was originally developed to be applied over attic insulation to eliminate the problem of R-factor degradation of fibrous insulation caused by air currents while allowing any moisture convecting and permeating from the conditioned spaces below to work its way out into the attic.